Original paper

Insights on lithospheric structures within the stable craton U.S.A., based on magnetic and gravity data

Hildenbrand, T. G.; Jachens, R. C.; Simpson, R. W.

Global Tectonics and Metallogeny Volume 6 Number 2 (1996), p. 113 - 117

4 references

published: Jul 31, 1996

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Abstract

The magnetic and gravity methods are based on the measurement and study of small variations in the Earth's magnetic and gravitational fields, respectively. Resulting anomaly maps provide insights on the lateral variations in magnetization and density within the lithosphere and thus assist in providing a geologic image of the subsurface. Moreover, regional magnetic and gravity data provide a powerful tool for studying the geophysical framework of continents and their offshore regions. In the present study we discuss current approaches in magnetic and gravity analyses and examine related anomaly maps of the stable craton of the U.S.A. (and bordering physiographic provinces) to demonstrate the utility of these data to characterize the subsurface down into the mantle. By applying filters to regional data we increase the usefulness of the data for studying continental structures and tectonic evolution. Lastly, metallic ore deposits are superimposed on derived anomaly maps to draw general conclusions on the utility of regional gravity and magnetic data in mineral exploration.

Keywords

lithosphericstable cratongravitational fieldsphysiographicmagnetic data